Drill bit and lubricator



G. ENGELBREKT, DECDP M. ENGELBREKT, ADMINISTRATRIX- DRILL BIT AND LUBRICATOR.

I APPLICATION FILED FEB. 15.1918. 1 ,404,016', Patented Jan. 17, 1922.

UNITED STA'l lEE IE TlENT OFFICE.

GUSTAF ENGELBREKT, OF SUPERIOR, WISCONSIN; MARY ENGELBREKT, ADMINISTRA- TRIX OF SAID GUSTAF ENG-ELBREKT, DECEASED, ASSIGNOR OF ONE-FOURTH TO ERNEST A. BORG STROM, ONE-FOURTH TO JOHN A. ANDERSON, AND ONE-FOURTH TO FRITZ HENDERSON, ALL OF SUPERIOR, WISCONSIN.

DRILL BIT AND LUBRICATOR.

Application filed February 15, 1918 To all whom it may concern Be it known that I, GUSTAF ENGELBREKT, a citizen of the United States, residing at Superior, in the county of Douglas and State of lVisconsin, have invented certain new and useful Improvements in Drill Bits and Lubricators, of which the following is a specification.

The invention has for an object to present a satisfactory appliance adapted to be attached to drills of various kinds to serve as an oil reservoir which will automatically feed a lubricant to the shank of the bit, in rder to save the same from excessive wear and damage. It is an important aim of the invention to give an appliance adapted to be used upon bits of the usual forms now in general use, without requiring special constructions of any kind in the bit stocks. A further important aim is toenable the device to be produced in a simple form, to occupy but little space and to be applied and removed quickly to and from the drill bit.

Additional objects and advantages may appear from the construction and arrangement of parts hereinafter set forth and shown in the drawings, wherein,

Figure 1 is a longitudinal sectional view of one form of the device applied to a bit,

Figure 2 is a cross sectional view of the device,

Figure 3 is a view of the device adapted to bits with cylindrical shanks,

Figure 4 is a sectional view of a form of device including an oil reservoir.

There is illustrated a drill bit 10, which in the present instance is represented as having three grooves 11 therearound, thedrill shown in Figure 1 being represented as having a tapering shank 12 terminating in the rectangular tang 13, adapted to be engaged in a familiar form of drill chuck.

Upon the shank 12' there is engaged a cup element 14, of approximately cylindrical form, having a thickened bottom portion 15, through which there is formed a concentric opening 16, the sides of which are fluted as at 17 forming a multiplicity of small longitudinal passages when the opening 16 is fitted snugly upon the shank 12, these passages leading from within the cup 14. The opening 16 is of a diameter to Specification of Letters Patent.

Patented Jan. 17, 1922.

Serial No. 217,346.

permit the cup to be adjusted upon the bit with a portion. of the grooves 11 closely thereadjacent or within the opening 16, as shown. The major diameter of the cup and the thickness of its wall is such that the annular space 17 around the shank 12 within the cup will. readily accommodate packing material 18 loosely disposed therein. The packing may be varied or dispensed with, as desired. The outer end of the cup wall is interiorly threaded, and receives a gland 19, having a head 20 adapted to be manipulated or engaged by a tool for rotation of the gland. The opening through the gland is of a size t permit it to fit loosely around the shank 12 when screwed into the cup asfar as desired, as it is not necessary for the cup to be held in exact concentric relation to the bit, and the gland is not depended upon for this purpose.

In the use of the device in this arrangement, the cup 14 is simply adjusted upon the shank 12 and pressed toward the drill point until it becomes wedged at the thickest part or" the shank, after which the cotton waste or other suitable material 18 is disposed within the cup around the bit shank and liberally saturated with oil of a suitable character or the cup filled therewith. The gland 19 is then adjusted in the cup and screwed downwardly as far as necessary. \Vhen the bit is adjusted in vertical position, the oil escaping through the passages formed by the fluting 17 moves downwardly upon the surfaces of the bit until it reaches the point, as will be readily understood. To renew the oil supply, it is simply necessary to remove the gland 19 until it clears the upper part of the cup sufficiently to permit the insertion of an oil can spout, through which the oil may be replenished. \Vhen the drill is in operation, an occasional turn of the gland 19 will insure the continued feeding of the lubricant in the proper uantity.

In Figure 3, the device is s 1OWI1 in a form that may be constructed approximately in the same shape as before described, and if so desired, a spring element 25 may be mounted thereon to engage the shank of a cylindrical bit to prevent casual displace ment of the device. In order to accommodate the clamping device, a kerf 26 is cut in the bottom of the cup 14 which in the present instance corresponds to the cup 1% first described, and a spring formed of wire adjusted with its intermediate portion extended through the kerf, while a pin 27 is inserted through the bottom portion of the cup and extending across the kerf. The lower part of the spring is formed with a coil 28, and a longitudinal arm 29 having an outwardly turned extremity, and adapted to bear against the shank 30 shown e11- The arm 31 is extended beyond the top of the cup and curved so that when the gland 20 is screwed into the cup it will engage the end of the arm 31 and bear it outwardly,

causing a positive binding of the lower part of the device against the shank of the bit.

In Figure 4 a method of forming the cup is illustrated, adapted to serve as a reservoir for a considerable quantity of lubricant, which may be found desirable upon bits used for making bores of considerable length. In this instance, the cup is in the shape of a bow1, the sides of which have the form of an ogee in cross section, the. base of the bowl having an extension aperture to receive a bit, while the upper part is enlarged lat erally to give it ample capacity. The upper side of the-bowlis formed with an opening of considerable size, for convenience in manufacture, which, is closed by a cap plate 34, suitably apertured at its center to receive the bit shank and provided at the longitudi nal outward extension 35 by which it may be rotated for emplacement or removal. In

this form ofthe device the packing or other material may be loosely arranged in the' lower part of the bowl,'or omitted as found desirable, it being possible to close some of the grooves not registered with the grooves of the bit, leaving only a few others immediately adjacent the bit grooves open, through which oil may feed freely to the bit.

What is claimed:

A device of the character described comprising a cup element having anopening through its bottom adapted to receive slid- V ably. a bit shank, a spring element pivoted upon the cup having an armextending therebelow' and adapted to bear against a bit shank, and'having an oppositely extended arm projected above the cup, and a gland element for the cup, said last named arm and. gland being constructed to coengage whereby the first named arm is borne inwardly to engage abit when the gland'is moved inwardly toward the cup.

- In testimony whereof I have affixed my signature in resence of two witnesses.

.USTAF E-NGELBREKT. iVitnesses: I

O. B. JORGENSON,

Gonrrr ENGELBREKT. 

